We know that it can seem unfair at times that we judge images on quality, which is of course a subjective value. But we do this because this method works for Danbooru and pleases the majority of the userbase. Don't take it personal if one or more of your uploads don't get approved. We've all been there, just live and learn. Details on how to appeal deletions that you see as unfair are on the Deletion Appeals page.
They never did. I thought it was amusing so I uploaded it, but feel free to flag if you think it shouldn't be here